Instructions for using PHP string regular replacement function preg_replace

1. preg_replace()

$msg = preg_replace("/ and the middle part
$msg = preg_replace("/<[^>]+>/", "", $msg); ----- is to delete <> and the content in between

i (PCRE_CASELESS)
If this modifier is set, the characters in the pattern will match both uppercase and lowercase letters.
s (PCRE_DOTALL)
If this modifier is set, the dot metacharacter (.) in the pattern matches all characters, including newlines. Without this setting, newline characters are not included. This is equivalent to Perl's /s modifier. Excluded character classes such as [^a] always match newlines, regardless of whether this modifier is set.


2. ereg() and eregi()

Note: The preg_match() function is usually a faster alternative than ereg()

eregi(" ]+)>(.+)",$data,$b)----Check whether there is a body tag in $data. If so, assign the parameter $b[0] and the middle part $b[1].

bool ereg ( string pattern, string string [, array regs] )

int eregi ( string pattern, string string, array [regs] )

eregi() and ereg() is similar and has the same usage. The difference is that ereg() is case-sensitive, while eregi() is case-independent.

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